I'm sorry to hear this. I had been testing this in Opera and had minimal issues. I have just accessed it in Chrome and it looks like it takes about a minute to load up from the character selection screen. The game should respond to inputs once the game has finished loading. I'll be looking to see if I can improve the loading times in a future release, and also include a downloadable version post game jam.
Thank you for bringing this to my attention
Vox